Chao estimator is not guaranteed to be asymptotically conservative with finite sampling efforts. A simple correction solves the issue. We illustrate with simulations and examples that the corrected Chao estimator is asymptotically conservative, and has lower standard error.

中文翻译：

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在采样次数有限的情况下进行校正以使Chao估计量变得保守

不能通过有限的采样工作来保证Chao估计量的渐近保守性。一个简单的更正解决了这个问题。我们通过仿真和示例说明，校正后的Chao估计量是渐近保守的，并且具有较低的标准误差。